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/**CFile****************************************************************
FileName [xsatHeap.h]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [xSAT - A SAT solver written in C.
Read the license file for more info.]
Synopsis [Heap implementation.]
Author [Bruno Schmitt <boschmitt@inf.ufrgs.br>]
Affiliation [UC Berkeley / UFRGS]
Date [Ver. 1.0. Started - November 10, 2016.]
Revision []
***********************************************************************/
#ifndef ABC__sat__xSAT__xsatHeap_h
#define ABC__sat__xSAT__xsatHeap_h
#include "misc/util/abc_global.h"
#include "misc/vec/vecInt.h"
ABC_NAMESPACE_HEADER_START
////////////////////////////////////////////////////////////////////////
/// STRUCTURE DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct xSAT_Heap_t_ xSAT_Heap_t;
struct xSAT_Heap_t_
{
Vec_Int_t * vActivity;
Vec_Int_t * vIndices;
Vec_Int_t * vHeap;
};
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int xSAT_HeapSize( xSAT_Heap_t * h )
{
return Vec_IntSize( h->vHeap );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int xSAT_HeapInHeap( xSAT_Heap_t * h, int Var )
{
return ( Var < Vec_IntSize( h->vIndices ) ) && ( Vec_IntEntry( h->vIndices, Var ) >= 0 );
}
static inline int Left ( int i ) { return 2 * i + 1; }
static inline int Right ( int i ) { return ( i + 1 ) * 2; }
static inline int Parent( int i ) { return ( i - 1 ) >> 1; }
static inline int Compare( xSAT_Heap_t * p, int x, int y )
{
return ( unsigned )Vec_IntEntry( p->vActivity, x ) > ( unsigned )Vec_IntEntry( p->vActivity, y );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapPercolateUp( xSAT_Heap_t * h, int i )
{
int x = Vec_IntEntry( h->vHeap, i );
int p = Parent( i );
while ( i != 0 && Compare( h, x, Vec_IntEntry( h->vHeap, p ) ) )
{
Vec_IntWriteEntry( h->vHeap, i, Vec_IntEntry( h->vHeap, p ) );
Vec_IntWriteEntry( h->vIndices, Vec_IntEntry( h->vHeap, p ), i );
i = p;
p = Parent(p);
}
Vec_IntWriteEntry( h->vHeap, i, x );
Vec_IntWriteEntry( h->vIndices, x, i );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapPercolateDown( xSAT_Heap_t * h, int i )
{
int x = Vec_IntEntry( h->vHeap, i );
while ( Left( i ) < Vec_IntSize( h->vHeap ) )
{
int child = Right( i ) < Vec_IntSize( h->vHeap ) &&
Compare( h, Vec_IntEntry( h->vHeap, Right( i ) ), Vec_IntEntry( h->vHeap, Left( i ) ) ) ?
Right( i ) : Left( i );
if ( !Compare( h, Vec_IntEntry( h->vHeap, child ), x ) )
break;
Vec_IntWriteEntry( h->vHeap, i, Vec_IntEntry( h->vHeap, child ) );
Vec_IntWriteEntry( h->vIndices, Vec_IntEntry( h->vHeap, i ), i );
i = child;
}
Vec_IntWriteEntry( h->vHeap, i, x );
Vec_IntWriteEntry( h->vIndices, x, i );
}
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline xSAT_Heap_t * xSAT_HeapAlloc( Vec_Int_t * vActivity )
{
xSAT_Heap_t * p = ABC_ALLOC( xSAT_Heap_t, 1 );
p->vActivity = vActivity;
p->vIndices = Vec_IntAlloc( 0 );
p->vHeap = Vec_IntAlloc( 0 );
return p;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapFree( xSAT_Heap_t * p )
{
Vec_IntFree( p->vIndices );
Vec_IntFree( p->vHeap );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapIncrease( xSAT_Heap_t * h, int e )
{
assert( xSAT_HeapInHeap( h, e ) );
xSAT_HeapPercolateDown( h, Vec_IntEntry( h->vIndices, e ) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapDecrease( xSAT_Heap_t * p, int e )
{
assert( xSAT_HeapInHeap( p, e ) );
xSAT_HeapPercolateUp( p , Vec_IntEntry( p->vIndices, e ) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapInsert( xSAT_Heap_t * p, int n )
{
Vec_IntFillExtra( p->vIndices, n + 1, -1);
assert( !xSAT_HeapInHeap( p, n ) );
Vec_IntWriteEntry( p->vIndices, n, Vec_IntSize( p->vHeap ) );
Vec_IntPush( p->vHeap, n );
xSAT_HeapPercolateUp( p, Vec_IntEntry( p->vIndices, n ) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapUpdate( xSAT_Heap_t * p, int i )
{
if ( !xSAT_HeapInHeap( p, i ) )
xSAT_HeapInsert( p, i );
else
{
xSAT_HeapPercolateUp( p, Vec_IntEntry( p->vIndices, i ) );
xSAT_HeapPercolateDown( p, Vec_IntEntry( p->vIndices, i ) );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapBuild( xSAT_Heap_t * p, Vec_Int_t * Vars )
{
int i, Var;
Vec_IntForEachEntry( p->vHeap, Var, i )
Vec_IntWriteEntry( p->vIndices, Var, -1 );
Vec_IntClear( p->vHeap );
Vec_IntForEachEntry( Vars, Var, i )
{
Vec_IntWriteEntry( p->vIndices, Var, i );
Vec_IntPush( p->vHeap, Var );
}
for ( ( i = Vec_IntSize( p->vHeap ) / 2 - 1 ); i >= 0; i-- )
xSAT_HeapPercolateDown( p, i );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void xSAT_HeapClear( xSAT_Heap_t * p )
{
Vec_IntFill( p->vIndices, Vec_IntSize( p->vIndices ), -1 );
Vec_IntClear( p->vHeap );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int xSAT_HeapRemoveMin( xSAT_Heap_t * p )
{
int x = Vec_IntEntry( p->vHeap, 0 );
Vec_IntWriteEntry( p->vHeap, 0, Vec_IntEntryLast( p->vHeap ) );
Vec_IntWriteEntry( p->vIndices, Vec_IntEntry( p->vHeap, 0), 0 );
Vec_IntWriteEntry( p->vIndices, x, -1 );
Vec_IntPop( p->vHeap );
if ( Vec_IntSize( p->vHeap ) > 1 )
xSAT_HeapPercolateDown( p, 0 );
return x;
}
ABC_NAMESPACE_HEADER_END
#endif
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